REL RCSB RCSB RCSB 2013-04-04 2013-07-03 2013-07-24 2013-08-14 Architecture of a helicase loading intermediate containing ORC-Cdc6-Cdt1-MCM2-7 on DNA reveals similarity to DNA polymerase clamp loading complexes Sun J Evrin C Samel S Fernandez-Cid A Riera A Kawakami H Stillman B Speck C Li H PreRC, ORC, Cdc6, Cdt1, Mcm2-7 Sun J Evrin C Samel SA Fernandez-Cid A Riera A Kawakami H Stillman B Speck C Li H Cryo-EM structure of a helicase loading intermediate containing ORC-Cdc6-Cdt1-MCM2-7 bound to DNA. NAT.STRUCT.MOL.BIOL. 20 944 951 2013 23851460 doi:10.1038/nsmb.2629 ORC-Cdc6-Cdt1-Mcm2-7 complex ORC-Cdc6-Cdt1-Mcm2-7 complex 14 1.1 ORC-Cdc6-Cdt1-Mcm2-7 complex Saccharomyces cerevisiae Baker's yeast 1.1 1 true singleParticle particle 0.1 7.5
50 mM HEPES-KOH
thin carbon layer on holey carbon, glow discharged
 ETHANE 70 FEI VITROBOT MARK I A thin carbon layer was floated onto holey carbon and glow discharged. 2.8 uL sample was added and after 30 seconds was blotted for 5 seconds and plunge-frozen. JEOL 2010F FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 200 2 1.2 4.4 60000.0 GATAN LIQUID NITROGEN Objective lens astigmatism was corrected at 400K magnification. 2010-03-08 GATAN ULTRASCAN 4000 (4k x 4k) NIKON SUPER COOLSCAN 9000 800 15 liquid nitrogen cooled
Particles were selected with e2boxer.py in swarm mode. Additional good particles were selected and bad particles were removed manually. After structural factor and CTF correction in EMAN1, the phase-flipped particles were normalized (edgenorm, hp=1) and pooled. Refine2d.py was run and particles in bad class averages were removed. Initial models were made using EMAN2, but 3D refinement was performed using EMAN1.8 without ctfc or ctfcw.
each particle set by ctfit
 OTHER 14.0 FSC 0.5 CUT-OFF EMAN1, EMAN2 92049 1104 emd_5625.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 56 56 56 -28 -28 -28 56 56 56 236.88 236.88 236.88 90.0 90.0 90.0 X Y Z -1.49997807 7.94068527 0.25216204 0.86932105 4.23 4.23 4.23 1.0 AUTHOR Reconstruction of ORC-Cdc6-Cdt1-Mcm2-7 complex at DNA origin in ATPrS
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